Tassle (IMAGE) Iowa State University Caption Most haploid plants, which have been chemically treated to become doubled haploid plants, are often only partially fertile. This is because some cells of the chemically treated seedlings will double their genomes, others will not. The tassels of doubled haploid plants like this one are sterile and produce no pollen. Credit Fred Engstrom Usage Restrictions None License Licensed content Disclaimer: AAAS and EurekAlert! are not responsible for the accuracy of news releases posted to EurekAlert! by contributing institutions or for the use of any information through the EurekAlert system.